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Karthik Kambatla commented on YARN-1297: ---------------------------------------- +1, checking this in. > Miscellaneous Fair Scheduler speedups > ------------------------------------- > > Key: YARN-1297 > URL: https://issues.apache.org/jira/browse/YARN-1297 > Project: Hadoop YARN > Issue Type: Improvement > Components: fairscheduler > Reporter: Sandy Ryza > Assignee: Yufei Gu > Attachments: YARN-1297-1.patch, YARN-1297-2.patch, > YARN-1297.005.patch, YARN-1297.006.patch, YARN-1297.3.patch, > YARN-1297.4.patch, YARN-1297.4.patch, YARN-1297.patch, YARN-1297.patch > > > I ran the Fair Scheduler's core scheduling loop through a profiler tool and > identified a bunch of minimally invasive changes that can shave off a few > milliseconds. > The main one is demoting a couple INFO log messages to DEBUG, which brought > my benchmark down from 16000 ms to 6000. > A few others (which had way less of an impact) were > * Most of the time in comparisons was being spent in Math.signum. I switched > this to direct ifs and elses and it halved the percent of time spent in > comparisons. > * I removed some unnecessary instantiations of Resource objects > * I made it so that queues' usage wasn't calculated from the applications up > each time getResourceUsage was called. -- This message was sent by Atlassian JIRA (v6.3.4#6332)